Abstract: A stormwater filter comprising: a vessel having an inlet and an outlet; and a screen disposed within the vessel and arranged to divide at least part of the vessel into an upper section and a lower section. The stormwater filter further comprises: a flow splitter positioned adjacent the inlet of the vessel and/or a substantially vertical screen disposed adjacent the outlet in the upper section of the vessel. The flow splitter comprises an inclined leading edge and first and second deflecting surfaces extending from the leading edge. The first and second deflecting surfaces are angled relative to one another so as to direct incoming flow laterally away from an axis between the inlet and the outlet. The vertical screen comprises first and second screen portions which are angled relative to one another. The first and second screen portions are each hingedly connected to the vessel and are detachably coupled to one another at their distal ends.

Abstract: A drainage system, comprising a collector which is arranged to collect liquid and a drainage pipe having a pipe inlet that opens into the collector such that liquid collected by the collector drains through the pipe inlet. The drainage pipe is provided with a vent spaced away from the pipe inlet. The vent is arranged such that, when liquid collected by the collector occludes the pipe inlet, liquid flowing through the drainage pipe draws air into the drainage pipe through the vent.

Abstract: A flow control assembly comprising: a mounting bracket attachable to a wall of a collection chamber, the mounting bracket having an opening extending therethrough; a flow control module detachably coupled to the mounting bracket, the flow control module having an inlet and an outlet, the outlet being aligned with the opening of the mounting bracket; and a gasket having an opening extending therethrough, the opening being smaller than the outlet of the flow control module and the opening of the mounting bracket. The gasket is disposed between the flow control module and the mounting bracket so as to seal the flow control module against the mounting bracket, with the opening of the gasket aligned with the outlet of the flow control module and the opening of the mounting bracket so as to restrict flow out of the flow control module. Also described is a corresponding kit of parts and method of installation.

Abstract: A stormwater filter comprising: a vessel having an inlet and an outlet; and a screen disposed within the vessel and arranged to divide at least part of the vessel into an upper section and a lower section. The stormwater filter further comprises: a flow splitter positioned adjacent the inlet of the vessel and/or a substantially vertical screen disposed adjacent the outlet in the upper section of the vessel. The flow splitter comprises an inclined leading edge and first and second deflecting surfaces extending from the leading edge. The first and second deflecting surfaces are angled relative to one another so as to direct incoming flow laterally away from an axis between the inlet and the outlet. The vertical screen comprises first and second screen portions which are angled relative to one another. The first and second screen portions are each hingedly connected to the vessel and are detachably coupled to one another at their distal ends.

Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A method of configuring a vortex flow control device 2 comprising a vortex chamber 4, an inlet 6 and an outlet 8 arranged at one end of the vortex chamber 4, wherein the method comprises the steps of: setting a target maximum flow rate FT-MAX through the outlet 8 for a predetermined pressure PT-MAX at the inlet; setting a target vortex initiation flow rate FT-VI through the outlet 8 at which vortex flow within the vortex chamber 4 initiates; determining the actual maximum flow rate FA-MAX through the outlet 8 for the predetermined pressure PT-MAX at the inlet 6; determining the actual vortex initiation flow rate FA-VI through the outlet 8; determining an error parameter E based on at least one of the actual maximum flow rate FA-MAX and the actual vortex initiation flow rate FA-VI and at least one of the target maximum flow rate FT-MAX and the target vortex initiation flow rate FT-VI; comparing the error parameter E against a target condition CT; and, if the error parameter E fails to satisfy the target condit

Abstract: A separator module for a stormwater gully chamber is disclosed, the separator module comprising: a partition arrangement which, in use, divides the chamber into an upper region and a lower region, the partition arrangement comprising: an inlet chute having an opening which, in use, provides an inlet to the lower region from the upper region; an outlet chute having an opening which, in use, provides an outlet from the lower region to the upper region; and a weir separating the outlet chute from the inlet chute; wherein at least a portion of the partition arrangement is flexible so as to allow an external diameter of the partition arrangement to be adjusted to fit different sized chambers.

Abstract: A method of configuring a vortex flow control device 2 comprising a vortex chamber 4, an inlet 6 and an outlet 8 arranged at one end of the vortex chamber 4, wherein the method comprises the steps of: setting a target maximum flow rate FT-MAX through the outlet 8 for a predetermined pressure PT-MAX at the inlet; setting a target vortex initiation flow rate FT-VI through the outlet 8 at which vortex flow within the vortex chamber 4 initiates; determining the actual maximum flow rate FA-MAX through the outlet 8 for the predetermined pressure PT-MAX at the inlet 6; determining the actual vortex initiation flow rate FA-VI through the outlet 8; determining an error parameter E based on at least one of the actual maximum flow rate FA-MAX and the actual vortex initiation flow rate FA-VI and at least one of the target maximum flow rate FT-MAX and the target vortex initiation flow rate FT-VI, comparing the error parameter E against a target condition CT; and, if the error parameter E fails to satisfy the target condit

Abstract: A flow regulating device 2 comprising a plurality of coaxial vortex chambers 16, 116, 216, 316 disposed in flow series. Each vortex chamber 16, 116, 216, 316 has an inlet 22, 122, 222, 322 disposed to promote rotational flow within the vortex chamber 16, 116, 216, 316, and an outlet 24, 124, 224, 324. A diffusion chamber 12, 112, 212 is disposed between adjacent vortex chambers 16, 116, 216, 316, and the outlet 24, 124, 224, 324 of one and the inlet 22, 122, 222, 322 of the other of the adjacent vortex chambers 16, 116, 216, 316 open into the diffusion chamber 12, 112, 212.

Abstract: A water treatment apparatus comprises a chamber divided by a partition into a treatment section and an outlet section. The treatment section may, for example, contain a filter media including organic material which supports a shrub or tree. Runoff water enters the treatment section over an inlet chamber which forms a bridge over the outlet section. During heavy flow conditions, some of the incoming water overflows inlet bypass weirs to pass directly to the outflow section, bypassing the filter media in the treatment section.

Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A vortex flow control device is manufactured by forming a template unit having end walls of which the wall has an outlet opening, and a partial outer wall. The partial outer wall has an opening. A plate is subsequently secured to the template unit to partially close the opening, to leave an inlet. The size of the plate is selected so as to result in an inlet 30 sized to achieve required flow characteristics for the finished device. The plate his inclined to a planar portion on the opposite side of the inlet at an angle in the range 85° to 95°, so as to induce turbulence in the region of the inlet.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: A water treatment apparatus comprises a chamber divided by a partition into a treatment section and an outlet section. The treatment section may, for example, contain a filter media including organic material which supports a shrub or tree. Runoff water enters the treatment section over an inlet chamber which forms a bridge over the outlet section. During heavy flow conditions, some of the incoming water overflows inlet bypass weirs to pass directly to the outflow section, bypassing the filter media in the treatment section.

Abstract: A separator 2 for separating solids, such as grit, from an influent, such as water, the tray assembly 4 comprising a plurality of nested tray units 14 which are spaced apart from one another along a vertical separator axis 16. Each tray unit 14 comprises a substantially conical tray 18, an aperture 20 in the apex of the tray 18, and a means for restricting flow through the respective aperture 20, such as a baffle 22 disposed at or adjacent the aperture 20. In use, grit is separated from water circulating among the trays 18 and falls through successive apertures 20 in each of the trays to exit through the bottom of the tray assembly 4. The baffles 22 restrict upward flow through the apertures 20 in the trays 18 thereby reducing agitation of the grit.

Abstract: A flow regulating device 2 comprising a plurality of coaxial vortex chambers 16, 116, 216, 316 disposed in flow series. Each vortex chamber 16, 116, 216, 316 has an inlet 22, 122, 222, 322 disposed to promote rotational flow within the vortex chamber 16, 116, 216, 316, and an outlet 24, 124, 224, 324. A diffusion chamber 12, 112, 212 is disposed between adjacent vortex chambers 16, 116, 216, 316, and the outlet 24, 124, 224, 324 of one and the inlet 22, 122, 222, 322 of the other of the adjacent vortex chambers 16, 116, 216, 316 open into the diffusion chamber 12, 112, 212.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: A vortex flow control device is manufactured by forming a template unit having end walls of which the wall has an outlet opening, and a partial outer wall. The partial outer wall has an opening. A plate is subsequently secured to the template unit to partially close the opening, to leave an inlet. The size of the plate is selected so as to result in an inlet 30 sized to achieve required flow characteristics for the finished device. The plate is inclined to a planar portion on the opposite side of the inlet at an angle in the range 85° to 95°, so as to induce turbulence in the region of the inlet.